I have been trying and trying to obtain Ice Breaker and G-horn over the past couple months. FINALLY RNG blessed me and on the SAME day I got the Ice Breaker from the Crota chest and then G-horn from beating Atheon on hard. Thank you RNGesus!!
(Now for Xur to sell that G-horn upgrade again)
Good luck to everyone else grinding to get one or both of these!
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Holy balls congrats man!